Scientists are now a step closer to wearable contact lenses which could use augmented reality to conjure up all sorts of info for our day to day living. That said it is only a proof of concept worn by rabbits (with no side affects may I add) and the lens can only light up a single pixel. But still, its proof that it works!
One of the things found so far is due to the tiny antenna (to pick up power) the power source needs to be about 2 centimeters away when the contact lens is worn. This will obviously be a problem that will be sorted once the technology improves, but currently it is a bit of an issue, especially once you add more pixels that need power if you want imagery and data displayed. Another issue is that information displayed on a contact lens would be too close for your eye to focus, so they are using ‘Fresnel lenses’ so they can project the image onto the retina as the lenses are thinner and flatter than normal contacts.